Verdict: Good month
St. Moritz Weather in September
September is mild-to-cool in St. Moritz, topping out near 12°C (54°F) — comfortable with a layer on. Expect showers on roughly 10 days of the month — rarely trip-ruining, worth planning around. Overall, September is a solid month to visit St. Moritz.
Average high
12°C / 54°F
Average low
3°C / 37°F
Rain days
~10
Precipitation
85 mm
What to pack for St. Moritz in September
- Layers — t-shirts under a light jacket or sweater
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in St. Moritz: Jul (17°C / 63°F) · Coolest: Jan (-2°C / 28°F) · Wettest: May (~14 rain days)
-2°
-11°
Jan
1°
-8°
Feb
1°
-8°
Mar
4°
-5°
Apr
8°
0°
May
14°
4°
Jun
17°
7°
Jul
17°
6°
Aug
12°
3°
Sep
8°
0°
Oct
3°
-6°
Nov
-1°
-9°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)